At least three different of these guys wrote on topics in the social sciences, so careful with the assignments.
1) Horton, John (John P.), After MacIntyre, politics lecturer, U. of York, b. 1951 (LC|n 85027288)
2) Horton, John, 1905-, Brahms orchestral music (LC|n 50030751)
3) Horton, John, 1932-, The Politics of Diversity, sociology emeritus UCLA (LC|n 85173902)
4) Horton, John, 1977-, Cultural Geographies, asst. prof. in Human Geography, U. of Northampton (LC|n 2013055316)
5) Horton, John, 1920-, , full name John Ryder Horton (LC|no 95058680). From Amazon: "John Ryder Horton was a naval officer in the Philippines when the Japanese attacked in 1941.... Postwar, Horton earned a Master's degree in International Relations at the University of Chicago and served thereafter as an operations officer with the CIA."
6) John Horton, PrestaShop 1.3 Beginner's Guide. From Amazon: "John Horton comes from a retail sales background ... John started his first e-commerce website in 2005.... John now has numerous e-commerce sites ... John has no formal, technical, or programming background, had no relevant previous business experience, [etc.]"